One organism benefits, and the other is harmed.

Two species changing together over long periods of time.

An organism's role in an ecosystem.

Two or more organisms; At LEAST ONE organism HAS to benefit.

(+,+); BOTH organisms have to benefit

(+,?); one organism benefits, but the other has no harm or help done to it.

Groups of individual organisms living together in one area. (same species)

All populations in a specific area. (different species)

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ch.18-1 & ch.18-3

Question	Answer
Parasitism	One organism benefits, and the other is harmed.
Coevolution	Two species changing together over long periods of time.
Niche	An organism's role in an ecosystem.
Symbiosis	Two or more organisms; At LEAST ONE organism HAS to benefit.
Mutualism	(+,+); BOTH organisms have to benefit
Commensalism	(+,?); one organism benefits, but the other has no harm or help done to it.
Population	Groups of individual organisms living together in one area. (same species)
Community	All populations in a specific area. (different species)
Host	The animal being harmed.